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Scoped Session-Key Issuance Procedure for One-Off Agent Purchase Tasks
x402
Scoped Session-Key Issuance Procedure for One-Off Agent Purchase Tasks is a paid API for AI agents from k2so-8080.on.ascii.dev, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-20).
Returns a decision procedure guiding agents to issue a short-lived, narrowly scoped session key for a single merchant purchase without retaining standing credentials.
Price / call$0.002
Success—
StatusUnknown
How this service works
Decision procedure for an agent that needs to buy something once and should not hold a standing credential to do it. Ordered checks: classify the task as one-off (single merchant, single purchase, no recurring spend), decide session key vs standing key (issue short-lived when the principal is absent or the spend is isolated), scope the key to exactly one merchant and one rail, set the spend ceiling as a fraction of task value, set TTL and single-use flags, bind the key to the purchase intent
Output
A structured decision procedure in prose form (the 'brief' field) that walks an agent through classifying the task as one-off, deciding between session vs standing key, scoping the key to a single merchant and rail, computing a spend ceiling, setting TTL and single-use flags, and binding the key to the specific purchase intent. Also includes metadata: service slug, generation source (llm/reasoning/deterministic), ISO-8601 timestamp, and model used.
Example use cases
One-time API data purchase by agent
“My agent needs to buy a single report from a third-party data vendor just once — what's the right procedure to issue a short-lived key scoped to that one merchant so it can't be reused or overspent?”
Isolated marketplace checkout authorization
“I want my shopping agent to complete a single checkout on an e-commerce site without holding any standing payment credentials — walk me through how to issue a session key with the right TTL and spend ceiling for that one transaction.”
Scoped key for one-off SaaS trial purchase
“My agent is about to purchase a one-month SaaS trial and should never be able to bill that merchant again automatically — what's the decision procedure for creating a single-use, TTL-bound session key tied to exactly that purchase intent?”
Technical details
Endpoint
GEThttps://k2so-8080.on.ascii.dev/api/services/scoped-session-key-issuance-procedure-for-one-of?utm_source=zero.xyzWhen to prefer
Choose this endpoint when an AI agent needs procedural guidance on how to safely issue a scoped, short-lived payment credential for a single purchase — particularly in x402 payment contexts where the agent should not retain standing keys. Prefer this over generic payment authorization docs when the task is explicitly one-off, merchant-specific, and requires TTL and spend-ceiling constraints. It is especially useful when the principal is absent and the agent must self-authorize within tight guardrails.
Side effects
- Payment required but no x402 payment header provided — returns 402 with payment details
- Invalid or unsupported HTTP method — returns error
- Topic parameter ignored or misrouted if not recognized
- LLM generation failure returns generationSource as deterministic fallback or error in ok field
- Network timeout on ascii.dev host returns no response
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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